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Thermoacoustic Engine
Mid term presentation
Advisor: Prof. Akiyoshi Iida
Assistant Prof. Hiroshi Yokoyama
Student: Subhan Ullah
Student ID: M135117
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Table of contents
• Background
• Objective
• Previous research
• Objective
• Experimental setup
• Results
• Conclusion
• Future plan
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Background
Sound power amplification
Cooling
RegeneratorHeater
Soundwaves
Thermoacoustic
oscillations
Heat Thermoacousticwork
Thermoacoustic
Engine
Backhaus, S. et al. Nature (1999)
Advantages:• No moving parts
– Maintenance is
cheap
• Environment friendly
– The working fluid is
helium and air
• Very simple andcheap
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Objective
• To understand the characteristics of the
loop-shaped double stage and single
stage Thermoacoustic engine
– Oscillation temperature ratio TH/TR
– Energy efficiency
– Pressure amplitude, Velocity amplitude and
the acoustic work
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Previous research
• ‘‘Thermoacoustics,’’ Nikolaus Rott [Adv. Appl. Mech. 20,
135 –175(1980)]. This article summarizes Rott’s theory of
heat-driven acoustic oscillations and streaming
developed through a series of articles published in Z.
Angew. Math. Phys. starting in 1969. That work providedthe theoretical foundation for the growth of
thermoacoustics that started shortly after the publication
of Rott’s review.
• ‘‘Thermoacoustic engines,’’ G. W. Swift, J. Acoust. Soc.
Am. 84 (4),1145 –1180 (1988).
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Experimental setup
Engine 1
Engine 2
52% of total length
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Measuring devices
• Thermocouples – To measure the
oscillation temperatureto calculate theoscillation temperatureratio
• Pressure sensors – To calculate the
pressure and velocityamplitude, phase, and
work by using 2 sensormethod
• Data logger
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Components of TA engine
Heaters
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Pressure
sensor
Resonance
tube
x
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Multiple stage performance
• For = 1.93
– The amplification factor for
1-stage engine is 1.76.
– It is 5.10 for 3-stageengine.
• For an amplification of5.10 by 1-stage engine,
the needs to be 5.00.
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Continued…
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Amplification of acoustic work in
Thermoacoustic engine
Assuming the ideal sterling engine
If = 2 for 1-stage
Then for 2-stage engine =
Pipe
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Resonance
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Conditions for Resonance
• The engine needs to be sealed carefully to ensure no
leakage.
• If the voltage for the heater is kept constant at 120Vthen it take about 2.4 hours to get resonancecondition.
• The stack used in this experiment has a structure of9/300 mil/cpi
2.
• The water flow rate should be enough to cool theregenerator.
• To oscillate both engines at the same time, thetemperature of the heaters should be kept the same.
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Results from the past experiment
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Conclusion • The first and most important step in this
research is to get resonance.
• The second most important task is to lowerthe onset temperature.
• If the joints are sealed well and the designconditions are fulfilled then the system canoscillate easily.
• The acoustic work and efficiency can befound after we get resonance.
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Future planDuring this year we got some basic knowledge
regarding thermoacoustics and its applications. Nowit’s the time to go forward for some practicalexperiments.
• To perform experiments on loop-shaped engine
and optimize its output power and efficiency by: – Using different types of stakes
– Insulating the heater area
– Changing the length of the engine and position or
number of stakes• After that, to make a double loop configuration and
comparison of both types with respect to efficiencyand other parameters.
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